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        <span style="font-family:Times New Roman;font-size:16px;">Hi all,</span> 
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        <span style="font-family:Times New Roman;font-size:16px;"><span style="font-family:SimSun;"></span></span> 
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        <span style="font-family:SimSun;"><span style="font-family:Times New Roman;font-size:16px;">     I am trying to use LaserSlab to </span><span style="font-family:Times New Roman;font-size:16px;">study the evolution of the electrons</span><span style="font-family:Times New Roman;font-size:16px;">, which needs the vacuum environment in order not to affect the emission of the electrons. I want to know </span><span style="font-family:Times New Roman;font-size:16px;">what is the minimum chamber pressure I can set? or in what pressure range is the simulation result accurate?</span></span> 
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        <span style="font-family:SimSun;"><span style="font-family:Times New Roman;font-size:16px;"><br>
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        <span style="font-family:SimSun;"><span style="font-family:Times New Roman;font-size:16px;">Thanks,</span></span> 
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        <span style="font-family:SimSun;"><span style="font-family:Times New Roman;font-size:16px;">Shizheng.</span></span> 
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        <span style="font-family:SimSun;"><span style="font-family:Times New Roman;font-size:16px;"><br>
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        <span style="font-family:SimSun;">Zhang Shizheng</span> 
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        <span style="font-family:SimSun;">PHD</span> 
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        <span style="font-family:SimSun;">Xi'an Jiaotong University</span> 
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        <span style="font-family:SimSun;">Institute for Science and Technology of Laser and Particle Beams</span> 
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